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post #11 of 17
Hey Charlie, can you explain more water-air delta? I'm interested in such things. I'm going to study electrical & computer engineering starting next year so...please?
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sniafniaf
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post #12 of 17
Basically Water-Air delta is the difference in temperature between the air entering the radiator and the water leaving the radiator. It scales almost perfectly linearly, meaning that a radiator with a 10C delta dissipates twice as much heat as a radiator at a 5C delta.

Generally when designing a water-cooling loop you want to aim for a water-air delta in between 5 and 10C, however you can go lower if you want an extreme setup. Of course the closer you want your delta to 0C the more radiator power you need. For example, Fat_Italian_Stallion uses a total of 17x120mm radiators to cool his 920 and tri-sli GTX 480s. This gives him around a 3C delta. If he wanted to drop another 2C off his loop he'd have to triple the amount of radiators he has.

You can also lower your water-air delta by increasing your fan speed, but again you run into diminishing returns.

Check out Skinnee Lab's Triple Radiator test for an awesome base of data if you want to calculate your own deltas.
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Labor of Love
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post #13 of 17
Thanks a lot, one last question: Is water-air delta related to ambient temperature? I'm thinking it that it may be related with it at higher-than-a-point temperatures, am I right?
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post #14 of 17
I am not quite sure what you mean by that. Delta stands for difference. If your ambient temperatures increases by 1C, your water temperature will increase by 1C and your delta will stay the same.

At different temperatures the changing viscosity in the air and water could have some effect, but the temperatures at which this would start to have an effect are well outside the bounds of traditional watercooling.
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post #15 of 17
What I meant is that as more as the ambient temperature gets closer to the water's temperature that just passed a block, the more water-air delta is there, is this right? Anyway I still got the point
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sniafniaf
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post #16 of 17
Thread Starter 
charliehorse,

I did look at the radiator comparison, and I think I have made some sense from it.

That is EXACTLY what I was looking for, and the explanation you gave was a big help.

I just want to know how to figure if things will work rather than ask specifics every time I change my mind on what's going into my system.


Thanks!

Paul
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post #17 of 17
On a sidenote, radiators scale pretty evenly so you can expect a 120mm radiator to dissipate 1/3 of the heat as a 360.
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Labor of Love
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